(Answered) At steady state the temperature profiles in a laminated

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At steady state the temperature profiles in a laminated system appear thus. Which material has the higher thermal conductivity?

Compute the Prandtl number for He and H₂O

a) by using the Eucken formula and experimental heat capacity data, at 1 atm and 300 K.

b) by using also the viscosity and the thermal conductivity of the relevant gases given below.

Gas	C_p x 10^-3	m x 10⁵	k
	J/kg K	Pa s	W/m K
He	5.193	1.995	0.1546
H₂O	1.864	1.041	0.02250

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